文献类型：期刊文献

英文题名：Phenanthrene biodegradation by halophilic Martelella sp AD-3

作者：Feng, T. -c.[1];Cui, C. -z.[1];Dong, F.[1];Feng, Y-y.[1];Liu, Y. -d.[1];Yang, X. -m.[1]

机构：[1]E China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China

年份：2012

卷号：113

期号：4

起止页码：779

外文期刊名：JOURNAL OF APPLIED MICROBIOLOGY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000308644600006)】；

基金：This project is supported by special fund of the Fundamental Research Funds for the Central Universities (no. WB1114031), State Key Joint Laboratory of Environment Simulation and Pollution Control (no. 11K02ESPCT) and the Specialized Research Fund for the Doctoral Program of Higher Education (no. 20110074130002).

语种：英文

外文关键词：biodegradation; halophilic micro-organism; metabolic pathway; phenanthrene; toxicity

摘要：Aims To investigate the phenanthrene-degrading abilities of the halophilic Martelella species AD-3 under different conditions and to propose a possible metabolic pathway. Methods and Results Using HPLC and GC-MS analyses, the phenanthrene-degrading properties of the halophilic strain AD-3 and its metabolites were analysed. This isolate efficiently degraded phenanthrene under multiple conditions characterized by different concentrations of phenanthrene (100-400 mg 1(-1)), a broad range of salinities (0.115%) and varying pHs (6.010.0). Phenanthrene (200 mg l-1) was completely depleted under 3% salinity and a pH of 9.0 within 6 days. The potential toxicity of phenanthrene and its generated metabolites towards the bacterium Vibrio fischeri was significantly reduced 10 days after the bioassay. On the basis of the identified metabolites, enzyme activities and the utilization of probable intermediates, phenanthrene degradation by strain AD-3 was proposed in two distinct routes. In route I, metabolism of phenanthrene was initiated by the dioxygenation at C-3,4 via 1-hydroxy-2-naphthoic acid, 1-naphthol, salicylic acid and gentisic acid. In route II, phenanthrene was metabolized to 9-phenanthrol and 9,10-phenanthrenequinone. Further study indicated that strain AD-3 exhibited a wide spectrum of substrate utilization including other polycyclic aromatic hydrocarbons (PAHs). Conclusions The results suggest that strain AD-3 possesses a high phenanthrene biodegradability and that the degradation occurs via two routes that remarkably reduce toxicity. Significance and Impact of the Study To the best of our knowledge, this work presents the first report of phenanthrene degradation by a halophilic PAH-degrading strain via two routes. In the future, the use of halophilic strain AD-3 provides a potential application for efficient PAH-contaminated hypersaline field remediation.